Illinois Weather Alert Sunday: Temps Drop to 37°F With Frost Risk After Chicago Rain Clears

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Illinois – Rain taps steadily on windshields across Chicago, and standing water is already building along low-lying streets and expressways early this afternoon.

According to the National Weather Service in Chicago, multiple flood warnings remain active as area rivers rise and urban drainage struggles to keep up. Periods of steady rain and earlier thunderstorms have pushed water levels higher, especially near creeks, viaducts, and flood-prone roadways.

Drivers across Cook County, including downtown Chicago, Cicero, and Oak Park, are seeing reduced visibility and slick pavement. Winds are gusting near 30 mph, adding to difficult travel on I-90, I-94, and Lake Shore Drive. Plan extra time if heading out, and avoid water-covered roads where depth is unclear.

Conditions begin to improve later today as rain tapers and clouds gradually break. Still, cooler air filters in quickly. By Sunday, highs struggle near 51°F with a lingering chance of spotty showers. The bigger shift arrives into early Monday morning, when temperatures dip into the upper 30s. Patchy frost may develop in outlying areas, especially west of the city.

That swing from wet roads to potential slick frost highlights a classic spring transition. Surfaces that stay damp today could briefly refreeze in colder pockets, creating isolated hazards for early commuters.

Looking ahead, a rebound is already in motion. Sunshine returns Monday afternoon with highs near 53°F, then a noticeable warm-up pushes temperatures close to 69°F by Tuesday with drier conditions.

Five Day Forecast for Chicago, IL:
Saturday: Rain early, then gradual clearing, high near 52°F
Sunday: Mostly sunny, slight shower chance, high near 51°F
Monday: Areas of frost early, then sunny, high near 53°F
Tuesday: Mostly sunny, high near 69°F
Wednesday: Mostly sunny, high near 68°F